bullish, adj. — Green’s Dictionary of Slang

bullish adj.

[Stock Exchange jargon bull, one who trades on the premise of a rising market]

enthusiastic, keen; thus bullishly adv.

1910		Yorks. Post 23 Nov. 11/5: Anticipations of a bullish Government report next month grought in fresh purchasing orders [...] prices rose sharply.
1961		(con. early 1950s) J. Peacock Valhalla 62: He had got bullishly drunk.
1999		Guardian Rev. 24 Sept. 8: The bullish head, the seriously nasty PE teacher.
2016		Guardian G2 30 Sept. 5/3: I get a bit bullish .